Apparatus for feeding pulverized fuel to furnaces



Aug. 5, 1930. F. H. RosENcRANTs APPARATUS vPOR FEEDING PULVERIZED FUEL TO FURNACES Filed April 29, 192'? 2 sheets-.sheet 1 Aug. 5, 1930. F. H. RosENcRANTs APPARATUS FOR FEEDING PULVERIZED FUEL TO'FURNACES Filed Aprjil 29, 1927 2 Sheets-Sheet 2 IIIIIIII Patented Aug. 5, 1930 Unirse s-'riwes PATENT orrici :my HARRY` RosENcRANrs, OF LONDON, ENGLAND, AssIeNORYTO INTERNATIONAL ooMBUsTIoN ENGINEERING coarORATIoN, or NEW volw, N. Y., A CORPORATION OF DELAWARE Y APPARATUS FOR FEEDING PULVERIZED FUEL TO FURNAES Applicatonled April 29, 1927, Serial No. 187,496, and in Great Britain May 1, 1926.

Another object of the invention .is to provide a feeder in which rapid wear of the parts with consequent change in capacity ,for 'a'. given speed and other difhculties are avoided. Still another object is toprovide a feeder in which theproportion of fuel to air blast may beeifectively controlled.

How the foregoing, together with such other objects and advantagesas may hereinafter appear', or are incident to my invention, are realized is illustrated in preferredy form in the accompanying drawings, wherein- F i g. 1 is a plan view of a feeder embodying my improvements; and

Fig. 2 is a vertical section taken substantially on the line 2-2 of Fig. l.

As shown in the accompanying drawing, the device comprises, in general, a bin or hopper A, feed means B and a delivery line or lines C. The bin or hopper A is provided with an apertured bottom 3, and a portion or throat i extending downwardly from said bottom, which throat is also provided with an apertured'bottom indicated by the numeral 5. In this instance the hopper bottom 3 is provided with two apertures 6, 6, and the throat bottom 5 is providedwith two apertures 7 7 ,preferably semi-circular, these apertures being respectively located .so that the l apertures G, 6 are out of registry with the apertures 7 7 for the purpose of preventing run of the material through the feeder. A feed wheel 8 is located within the throat 41', which feed wheel is provided with a pluality ofpockets 9 for receiving the material to be of the throat 4 is provided with an upwardly l extending conical portion 12` which constitutes a bearing for the shaft 11. VInthis'connectionit is pointed out that the feed wheel 8 is provided with a correspondin portionv13 which houses the conica? bearing 12. From the cone 13 thefeed wheel extends horizontally outward in the form of a pocket' ed or spoked disc.

Extending downwardly 'from the hopper b ottom to close proximity with the flat p-ortion 14 of the wheel 8 I'have provided a neck 15 for each of the openings 6, 6, which necksl serve to confine the flow of material from the openings to the pockets of the feed wheel.

4As the-wheel rotates material thus Vreceived by the pockets is advanced to theopenings 7, 7, in the throat bottom and discharged into` the delivery lines C. In this connect-ion it isV through the openings occurs lirsst'atthe inner. end of each arm and is finished at the outer surroundingthe nozzle. The nozzle 16 and the member 17 are so disposed with one an`c other that the nozzle terminates inthe region of the venturi, or more specifically stated, the nozzle 16 is of suchlength that its end 18 conical lies substantially at the restricted portion 19 of the member 17. y

`An air inlet 2O is provided for the member 17, in this instance in the form of a horizontally extending pipe portion 21, which is connected to any suitable source of air supv ply. An air damper, not shown, may be provided for regulating the amount of air to be admitted. v

From the foregoing it will be seentliat the blast of air admitted at 20 serves to transport the fuel from the discharge endv of theY nozzles to the burners of anv associated furnace, not shown, by means of pipes which may be connected to the members 17 by means of the flanges 22. By virtue of the venturi and the nozzles the pressure at the inletend of the that in some cases I contemplate having the fuel enter the venturi'at anangle.

vI have provided gatesv or valves 23 for regu l'ating the amount of fuel to be advanced from the hopper` vv'hichfgates may be closedwhen it is desired to close off` an opening entirely. If desiredl other gates may be` provided for closing off the inlet to the discharge line when theY line is out of use.

'In order to avoid archingof the fuel in the bin or hopper over the openings 6, 6 in its bottom, a revolving arm 'or arms 24 are provided, which may be'secured to the shaft 11 for rotation therewith. These arms sweep 4 over the surface ofthe hopper bottom.

In order to control the proportion of fuel to the blast, thehorizontal portion 21 of eac air 'supply line may be connected with the enclosed space 25 between the bottom of the hopper and the bott-om of the throat by means Giri,

cfpipes 26 and 27, a valve 28 being located at the junction of said pipes. Air entering this space in amount controlled by the valve nti-ingles with the fuel passing intothe nozzles 16y and facilitates the iiow of fuelunder action of the diminished pressureproduced at the venturi. y 1

. I claim :e-

. 1. InY a feeder for pulverized coal and the like, the combination of a. hopper having a pair of apertured bottoms spaced Vsubstan- 1 tially apart, the aperture iii one bottom being out of alignment ivith'theaperture in the other bottom, a rotatable poclreted feed Wheel adjacent one of said bottoms and vspaced from the otherl bottom, and a neck confining the flow of material from the aperture in the last mentioned bottom to the feed Wheel, said neck having capacity for suflicient material to fill a plurality of pockets.

2. In a feeder for pulverized'coal and the lilre, the combination of a hopper havingI an aperturcdbcttom. a throat extending down Wardly from said bottom and having an apertured bottom, the aperture of Which is out of alignment With the aperture in the hopper bottom, a rotatable feed Wheel for passing the fuel enteringsaid throat to the aperture in said throat bottoni, a fitting associated with said last mentioned aperture having` a nozzle and a venturi-shaped portion at the point of discharge of said nozzle and a delivery'line adapted to be secured to said fitting.

3. In combination with a bin, a feeder comprising tivo spaced apertured plates, an intermediate pocketed plate, certain of said plates being` stationary and the remainder rotatable for the iuroose of advancinn material from' the bin, anda delivery line into which the material advanced. is. discharged, said line including aventuri-shaped portion at itsA inlet end With means for securing it tothe feeder to receive the discharge therefrom, and means for admitting air to the delivery line.

at the venturi-shaped portion. Y

el". In combination With a bin, a feeder comprising tivo spaced apertured'plates, an inter4 Vmediate pocketed plate, certain of said plates being stationary and the remainder rotatable for the purpose of advancing material fiom the bin, and a deliveryl line into which the material advanced is discharged, said line having a venturi-shaped portion at its inlet end, a discharge nozzle terminatingfin the region of the venturi, means for admitting air to the venturi-shaped portion, and means for SIM Hill

securing it to the feeder to receive the discharge therefrom.

v 5. In a feeder for pulverized coa-l and the like, the combination of ahopper having an,l

apertured bottoni, a throat extending Adovvnf wardly from said bottom and having an apertured bottom, the aperture of Which is out of Valig'iiment with the aperture in the vhopper bottom, a. rotatable feed wheel for passing the fuel entering said throat to thea'perture in said throat bottom, a nozzle associated with said last mentioned aperture, and a delivery line having a venturieshaped portion atthe point of discharge of said nozzle, together with ya valve controlled passage'for leading air into the interior of the aforementioned throat.

6. In combination with a bin, a feeder coniprisiiig tivo spaced' apertured plates, an enclosed chamber between said plates, a rotatable poclreted plate Within said chamber foradvfancing material from the bin, adelivery line int-o which the material advanced is eischarged, said line including a venturi-shaped portion in pro-siniity to the point of Vdiecharge fro-m the feeder, an air line for introducing air into the delivery line, and a valve controlled passage connecting the air line with the interior of the aforesaid enclosed chamber.

7. In a feeder for pulverized coal and the like, the combination of a hopper having an apertured bottom, a throat extending downwardly from said botto-m and having an apertured bottom, the aperture of which is out of alignment with the aperture in the hopper bottom, a rotatable feed wheel for passing the fuel entering said throat to the aperture in said throat bottom, a nozzle associated with said last mentioned aperture, and a delivery line having a venturi-shaped portie-n at the point of discharge of said nozzle, to gether with means for introducing air under pressure into the interior of the aforementioned throat.

8. In combination with a bin, a feeder comprising two spaced apertured plates, an enclosed chamber' between said plates, a rotatable pocketed plate within said chamber for advancing material from the bin, a delivery line into which the material advanced'is discharged, and means for introducing pressure air into the interior of the aforesaid enclosed chamber.

9. In combination with a bin, a feeder comprising two spaced apertured plates, an enclosed chamber between said plates, a rotatable pocketed plate Within said chamber for advancing material from the bin, a delivery line into which the material advanced is discharged, an air line for introducing air into the deliveryline, and a passage for leading air from the air line into the interior of the aforesaid enclosed chamber.

lO. In combination with a b in, a feeder comprising two spaced aperturedl plates, an enclosed chamber between said plates, a rotatable pocketed plate Within said chamber for advancing material from the bin, a delivery line into which the material advanced is discharged, an air line for introducing air into the delivery line and a passage for leading air from the air line into the interior of the aforesaid enclosed chamber, together with means for regulating the pressure of the air in said chamber with relation to the pressure of the air in the delivery line. Y

ll. In a feeder for pulverized coal and the like, the combination of a hopper having a pair of apertured bottoms spaced substantially apart, the aperture in one bottom being out of alignment with the aperture in the other bottom, a rotatable feed wheel adjacent one of said bottoms and spaced from the other i bottom, and a neck confining the flo-W of mates rial from the aperture in the last mentioned bottom to the feed Wheel, said neck increasing in area toward the feed wheel.

12. In a feeder for pulverized coal and the like, the combination of a hopper having a pair of apertured bottoms spaced substantially apart, the aperture in one bottom being out of alignment with the aperture in the other bottom, a rotatable pocketed feed wheel adjacent one of said bottoms and spaced from V FAY HARRY Ro'sENoRANTs.

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